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In the portable continuity, Material-L is the Material in charge of "power" (力chikara),[2] part of the System U-D materialised as a clone of Fate Testarossa during the Dark Fragment Incident. She is first introduced in The Battle of Aces in English Material-L and in Japanese "Assailant of Thunderblade" (雷刃の襲撃者Raijin no Shūgekisha).

In The Gears of Destiny, it is revealed her full name is Levi the Slasher(レヴィ・ザ・スラッシャー[3]Revi za Surasshā, usually rubied as 雷刃の襲撃者(レヴィ・ザ・スラッシャー)), which may be shortened as Levi(レヴィRevi, usually rubied as 雷刃(レヴィ)). Levi is short for "levin", an archaic word for "lightning". Nevertheless, in the scenario U-D still calls her Material-L in Japanese.[1]

Unlike Fate, Levi is very outgoing and often childish, but also prone to going berserk. She also likes to nickname others, e.g. Signum as "Bushido" (ブシドーBushidō), Reinforce as "Black Feather" (クロハネKurohane) etc.

Levi Russel(レヴィ・ラッセルRevi Rasseru) is an international student studying abroad in Uminari City, owning the title "Levi the Slasher" for Brave Duel games. As a human, her pupils are no longer contracted. Her battle-related designs are based on Fate's in The MOVIE 2nd A's instead.

In The Battle of Aces, Material-L is one of the most powerful characters, combining Fate's speed in melee with Signum's weapons finesse and long-range defenses and Chrono Harlaown's extensive Full Drive enhancement skills. After Levi acquires her new powers upon reviving in The Gears of Destiny, lightning effects of her spells also change from golden-purple to her new aqua blue (水色mizuiro)[5] magic color.

As revealed in The Gears of Destiny Material Girls., Levi's protective clothing, presumably a Midchildan Barrier Jacket, is known as Slash Suit(襲撃服(スラッシュスーツ)Surasshu Sūtsu, lit. Assault Clothing). Its design (except colors) is same as that of Fate's Barrier Jacket "Lightning Form" in A's.

In The Gears of Destiny, Levi's Slash Suit gains a speed-oriented variation named Sprite Form(スプライトフォームSupuraito Fōmu). Its design (except colors) is same as that of Fate's Barrier Jacket "Sonic Form" in A's.

In the movie continuity, Levi's Slash Suit has instead an original new design, although the overall style is still similar to Fate's.